Danfoss VLT AutomationDrive FC 300 Design Manual page 51

FC 300 Design Guide
3. Reapply 24 V DC to terminal 37. The test step is passed if the motor remains in the coasted state, and the mechanical brake (if connected)
remains activated. Step 1.4: Send Reset signal (via Bus, Digital I/O, or [Reset] key). The test step is passed if the motor becomes operational
again.
The commissioning test is passed if all four test steps 1.1, 1.2, 1.3 and 1.4 are passed.
Case 2: Automatic Restart of Safe Stop is wanted and allowed (i.e. Safe Stop only where parameter 5-19 is set to [3], or combined
Safe Stop and MCB112 where parameter 5-19 is set to [7] or [8]):
1. Remove the 24 V DC voltage supply to terminal 37 by the interrupt device while the motor is driven by the FC 302 (i.e. mains supply is not
interrupted). The test step is passed if the motor reacts with a coast and the mechanical brake (if connected) is activated, and if an LCP is
mounted, the warning "Safe Stop [W68]" is displayed.
2. Send Reset signal (via Bus, Digital I/O, or [Reset] key). The test step is passed if the motor remains in the Safe Stop state, and the mechanical
brake (if connected) remains activated.
3. Reapply 24 V DC to terminal 37.
The test step is passed if the motor becomes operational again. The commissioning test is passed if all three test steps 2.1, 2.2, and 2.3 are passed.
NB!
The Safe Stop function of FC 302 can be used for asynchronous and synchronous motors. It may happen that two faults occur in the
frequency converter's power semiconductor. When using synchronous motors this may cause a residual rotation. The rotation can be
calculated to Angle=360/(Number of Poles). The application using synchronous motors must take this into consideration and ensure
that this is not a safety critical issue. This situation is not relevant for asynchronous motors.
NB!
In order to use the Safe Stop functionality in conformance with the requirements of EN-954-1 Category 3, a number of conditions must
be fulfilled by the installation of Safe Stop. Please see section
NB!
The frequency converter does not provide a safety-related protection against unintended or malicious voltage supply to terminal 37
and subsequent reset. Provide this protection via the interrupt device, at the application level, or organisational level.
For more information - see section
Safe Stop Installation
Safe Stop Installation
.
MG.33.BA.02 - VLT ® is a registered Danfoss trademark
3. Introduction to FC 300
for further information.
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